I suggest you ...

.less intellisense should support importing .less files from node_modules (~ or npm:// prefix)

In my .less files, I'm importing other .less files from a node module by using a ~ prefix (import "~mymodule/file.less"). Intellisense doesn't seem to understand the import, it underlines variables and mixins from that import as "undeclared mixin" / "undeclared variable".

.less IntelliSense should support importing .less files from node_modules by using either the ~moduleName or npm://moduleName prefixes.